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vm: Allow VM to make self calls when needed.

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Change-Id: I7aada24adad3dc6bfe5b0bd4a50b5005c79ff887
This commit is contained in:
Cristiano Giuffrida 2014-03-12 00:23:01 +01:00 committed by David van Moolenbroek
parent 63483e02e6
commit 65b4b95259
3 changed files with 50 additions and 1 deletions
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5
minix/servers/vm/acl.c
View file

@ -36,6 +36,11 @@ acl_init(void)
int
acl_check(struct vmproc *vmp, int call)
{
/* VM makes asynchronous calls to itself. Always allow those. */
if (vmp->vm_endpoint == VM_PROC_NR)
return OK;
/* If the process has no ACL, all calls are allowed.. for now. */
if (vmp->vm_acl == NO_ACL) {
printf("VM: calling process %u has no ACL!\n",

43
minix/servers/vm/mmap.c
View file

@ -483,6 +483,30 @@ int do_get_refcount(message *m)
return r;
}
/*===========================================================================*
* munmap_vm_lin *
*===========================================================================*/
int munmap_vm_lin(vir_bytes addr, size_t len)
{
if(addr % VM_PAGE_SIZE) {
printf("munmap_vm_lin: offset not page aligned\n");
return EFAULT;
}
if(len % VM_PAGE_SIZE) {
printf("munmap_vm_lin: len not page aligned\n");
return EFAULT;
}
if(pt_writemap(NULL, &vmproc[VM_PROC_NR].vm_pt, addr, MAP_NONE, len, 0,
WMF_OVERWRITE | WMF_FREE) != OK) {
printf("munmap_vm_lin: pt_writemap failed\n");
return EFAULT;
}
return OK;
}
/*===========================================================================*
* do_munmap *
*===========================================================================*/
@ -490,6 +514,7 @@ int do_munmap(message *m)
{
int r, n;
struct vmproc *vmp;
struct vir_region *vr;
vir_bytes addr, len;
endpoint_t target = SELF;
@ -505,9 +530,25 @@ int do_munmap(message *m)
if((r=vm_isokendpt(target, &n)) != OK) {
panic("do_mmap: message from strange source: %d", m->m_source);
}
vmp = &vmproc[n];
if(m->m_source == VM_PROC_NR) {
/* VM munmap is a special case, the region we want to
* munmap may or may not be there in our data structures,
* depending on whether this is an updated VM instance or not.
*/
if(!region_search_root(&vmp->vm_regions_avl)) {
munmap_vm_lin(addr, m->VMUM_LEN);
}
else if((vr = map_lookup(vmp, addr, NULL))) {
if(map_unmap_region(vmp, vr, 0, m->VMUM_LEN) != OK) {
printf("VM: self map_unmap_region failed\n");
}
}
return SUSPEND;
}
if(m->m_type == VM_UNMAP_PHYS) {
addr = (vir_bytes) m->m_lsys_vm_unmap_phys.vaddr;
} else if(m->m_type == VM_SHM_UNMAP) {

3
minix/servers/vm/utility.c
View file

@ -142,6 +142,9 @@ int do_info(message *m)
break;
case VMIW_REGION:
if(m->m_lsys_vm_info.ep == SELF) {
m->m_lsys_vm_info.ep = m->m_source;
}
if (vm_isokendpt(m->m_lsys_vm_info.ep, &pr) != OK)
return EINVAL;